关于栈的程序出错在哪里？

#include<stdio.h>
#include<malloc.h>
#include<stdlib.h>
#define stack_init_size 100
#define stackincrement 10
typedef int ElemType;
typedef struct {
ElemType *base;
ElemType *top;
int stacksize;
}sqstack;

void initstack(sqstack *s)
{
 s->base=(ElemType *)malloc(stack_init_size*sizeof(ElemType));
    if(!s->base)
  exit(0);
 s->top=s->base;
 s->stacksize=stack_init_size;
}

 void push(sqstack *s,ElemType e)
 {
  printf("插入元素:");
  scanf("插入的元素为:%d",&e);
if(s->top-s->base>=s->stacksize)
{
  s->base=(ElemType *)realloc(s->base,(s->stacksize+stackincrement)*sizeof(ElemType));
  if(!s->base)
   exit (0);
  s->top=s->base+s->stacksize;
  s->stacksize+=stackincrement;
}
*(s->top)=e;
s->top++;
}

int main()
{
 sqstack *s;
 ElemType e;
 initstack(s);
 push(s,e);
 return 0;
}

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